Precision Nutrient Management
Post on 24-Feb-2016
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Precision Nutrient Management
Brian ArnallDepartment of Plant and Soil Sciences
Oklahoma State University
Precision Ag Class Wheat Lots of $
› Sprayer, No-till/Air seeder, GPS, Yield Monitor, Combine,
Wheat a little $› Grid, Veris, GPS Yield Monitor, Nrich and GS
Corn Lots of $› Planter, Strip till, Zones
Corn a little $› Planter upgrade, Gird, GS, Zone.
Variable Rate Tech Does VRT fertilizer (not lime) Result in More uniform yield across field More variable yield across field
Precision Nutrient Management Land
› Soil type, Slope, H20 Movement Soil
› Soil sample Composite, Zone, Grid
› Soil EC› Soil color
Plant› Tissue› Sensor› Yield
To Each His Own What is the problem What is the goal Time and Money Investment
Independence of Variables If you want to fix everything Don’t chase after one thing. Yield Monitor data for
› Phosphorus Potassium Lime Soils data for
› Nitrogen and Sulfur N and S (mobile) are yield based P and K (immobile) are soil test based Lime is Buffer Index based
Using 1 factor to determine other unrelated factors
Determining the Variable
P KP
Elevation
Buffer IndexBuffer Index
Lime required (tons 100% ECCE)
pH 6.8 pH 6.4
Over 7.1 None None7.1 0.5 None7.0 0.7 None6.9 1.0 None6.8 1.2 0.76.7 1.4 1.26.6 1.9 1.76.5 2.5 2.26.4 3.1 2.76.3 3.7 3.2
PhosphorusSoil Test P
Index
% Sufficien
cy
P2O5 lbs/a
c0 25 8010 45 6020 80 4030 85 3040 90 20
65+ 100 0
Soils Sampling
Soil Sampling
Sensors
Yield Monitor
Apps I have 29 Ag apps on my I-Pad
› 27 were free I use 6 regularly Identification
› weed and nutrient Easy to use Calculators
› Spray and fertilizer John Deere, Pioneer, Monsanto, Hew
Holland, ect ect ect ect. Customer based
First VRT VRT Lime due to cost/acre and
variability
Summary Now the reasons and goals Understand limitations Don’t have
to dive in Head first
Thank you!!!
Brian Arnall373 Ag Hall405-744-1722b.arnall@okstate.eduPresentation available @ www.npk.okstate.eduTwitter: @OSU_NPKYouTube Channel: OSUNPK
www.extensionnews.okstate.edu
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